<template>
	<div>
		<!-- 面包屑导航区域 -->
		<el-breadcrumb separator-class="el-icon-arrow-right">
			<el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
			<el-breadcrumb-item>商品管理</el-breadcrumb-item>
			<el-breadcrumb-item>添加商品</el-breadcrumb-item>
		</el-breadcrumb>

		<!-- 卡片视图 -->
		<el-card>
			<!-- 提示区域 -->
			<el-alert title="添加商品信息" type="info" center show-icon :closable="false"> </el-alert>

			<!-- 步骤条区域 -->
			<el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
				<el-step title="基本信息"></el-step>
				<el-step title="商品参数"></el-step>
				<el-step title="商品属性"></el-step>
				<el-step title="商品图片"></el-step>
				<el-step title="商品内容"></el-step>
				<el-step title="完成"></el-step>
			</el-steps>

			<!-- tab栏区域 -->
			<el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
				<el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
					<el-tab-pane label="基本信息" name="0">
						<el-form-item label="商品名称" prop="goods_name">
							<el-input v-model="addForm.goods_name"></el-input>
						</el-form-item>
						<el-form-item label="商品价格" prop="goods_price">
							<el-input v-model="addForm.goods_price" type="number"></el-input>
						</el-form-item>
						<el-form-item label="商品重量" prop="goods_weight">
							<el-input v-model="addForm.goods_weight" type="number"></el-input>
						</el-form-item>
						<el-form-item label="商品数量" prop="goods_number">
							<el-input v-model="addForm.goods_number" type="number"></el-input>
						</el-form-item>
						<el-form-item label="商品分类" prop="goods_cat">
							<el-cascader v-model="addForm.goods_cat" :options="catelist" :props="cateProps" @change="handleChange"></el-cascader>
						</el-form-item>
					</el-tab-pane>
					<el-tab-pane label="商品参数" name="1">
						<!-- 渲染表单的Item项 -->
						<el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
							<!-- 复选框组 -->
							<el-checkbox-group v-model="item.attr_vals">
								<el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
							</el-checkbox-group>
						</el-form-item>
					</el-tab-pane>
					<el-tab-pane label="商品属性" name="2">
						<el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
							<el-input v-model="item.attr_vals"></el-input>
						</el-form-item>
					</el-tab-pane>
					<el-tab-pane label="商品图片" name="3">
						<!-- action表示图片要上传到的后台api地址 -->
						<el-upload :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture" :headers="headerObj" :on-success="handleSuccess">
							<el-button size="small" type="primary">点击上传</el-button>
						</el-upload>
					</el-tab-pane>
					<el-tab-pane label="商品内容" name="4">
						<!-- 富文本编辑器组件 -->
						<quill-editor v-model="addForm.goods_introduce"></quill-editor>
						<!-- 添加商品的按钮 -->
						<el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
					</el-tab-pane>
				</el-tabs>
			</el-form>
		</el-card>

		<!-- 图片预览 -->
		<el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
			<img :src="previewPath" alt="" class="previewImg" />
		</el-dialog>
	</div>
</template>

<script>
import _ from 'lodash'

export default {
	data() {
		return {
			activeIndex: '0',
			// 添加商品的表单数据对象
			addForm: {
				goods_name: '',
				goods_price: 0,
				goods_weight: 0,
				goods_number: 0,
				// 图片的数组
				pics: [],
				// 商品的详情描述
				goods_introduce: '',
				attrs: []
			},
			addFormRules: {
				goods_name: [{ required: true, message: '请输入商品名称', trigger: 'blur' }],
				goods_price: [{ required: true, message: '请输入商品价格', trigger: 'blur' }],
				goods_weight: [{ required: true, message: '请输入商品重量', trigger: 'blur' }],
				goods_number: [{ required: true, message: '请输入商品数量', trigger: 'blur' }],
				goods_cat: [{ required: true, message: '请选择商品分类', trigger: 'blur' }]
			},
			// 商品分类列表
			catelist: [],
			cateProps: {
				expandTrigger: 'hover',
				label: 'cat_name',
				value: 'cat_id',
				children: 'children',
				// 商品所属的分类数组
				goods_cat: []
			},
			// 动态参数列表数据
			manyTableData: [],
			// 静态属性列表数据
			onlyTableData: [],
			// 上传图片的URL地址
			uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
			// 图片上传组件的headers请求头部对象
			headerObj: {
				Authorization: window.sessionStorage.getItem('token')
			},
			previewPath: '',
			previewVisible: false
		}
	},
	created() {
		this.getCateList()
	},
	methods: {
		// 获取所有商品分类数据
		async getCateList() {
			const { data: res } = await this.$http.get('categories')

			if (res.meta.status !== 200) {
				return this.$message.error('获取商品分类数据失败!')
			}

			this.catelist = res.data
			console.log(this.catelist)
		},
		// 级联选择器选中项变化，会触发这个函数
		handleChange() {
			console.log(this.addForm.goods_cat)
			if (this.addForm.goods_cat.length !== 3) {
				this.addForm.goods_cat = []
			}
		},
		beforeTabLeave(activeName, oldActiveName) {
			if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
				this.$message.error('请选择商品分类!')
				return false
			}
		},
		async tabClicked() {
			// console.log(this.activeIndex)
			// 证明访问的是动态参数面板
			if (this.activeIndex === '1') {
				const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })

				if (res.meta.status !== 200) {
					return this.$message.error('获取动态参数列表失败!')
				}

				res.data.forEach(item => {
					item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
				})
				this.manyTableData = res.data
			} else if (this.activeIndex === '2') {
				const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })

				if (res.meta.status !== 200) {
					return this.$message.error('获取静态属性列表失败!')
				}

				console.log(res.data)
				this.onlyTableData = res.data
			}
		},
		// 处理图片预览效果
		handlePreview(file) {
			this.previewPath = file.response.data.url
			this.previewVisible = true
		},
		// 处理移除图片的操作
		handleRemove(file) {
			// console.log(file)
			// 1. 获取要删除的图片的临时路径
			const filePath = file.response.data.tmp_path
			// 2. 从pics数组中，找到这个图片对应的索引值
			const i = this.addForm.pics.findIndex(x => {
				x.pic === filePath
			})
			// 3. 调用数组的splice方法，把图片信息对象，从pics数组中移除
			this.addForm.pics.splice(i, 1)
		},
		// 监听图片上传成功的事件
		handleSuccess(response) {
			// console.log(response)
			// 1. 拼接得到一个图片信息对象
			const picInfo = { pic: response.data.tmp_path }
			// 2. 将图片信息对象，push到pics数组中
			this.addForm.pics.push(picInfo)
			console.log(this.addForm)
		},
		// 添加商品
		add() {
			this.$refs.addFormRef.validate(async valid => {
				if (!valid) {
					return this.$message.error('请填写必要的表单项!')
				}
				// 执行添加的业务逻辑
				// lodash cloneDeep(obj)
				const form = _.cloneDeep(this.addForm)
				form.goods_cat = form.goods_cat.join(',')
				// 处理动态参数
				this.manyTableData.forEach(item => {
					const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals.join(' ') }
					this.addForm.attrs.push(newInfo)
				})
				// 处理静态属性
				this.onlyTableData.forEach(item => {
					const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
					this.addForm.attrs.push(newInfo)
				})
				form.attrs = this.addForm.attrs
				console.log(form)

				// 发起请求添加商品
				// 商品的名称，必须是唯一的
				const { data: res } = await this.$http.post('goods', form)

				if (res.meta.status !== 201) {
					return this.$message.error('添加商品失败!')
				}

				this.$message.success('添加商品成功!')
				this.$router.push('/goods')
			})
		}
	},
	computed: {
		cateId() {
			if (this.addForm.goods_cat.length === 3) {
				return this.addForm.goods_cat[2]
			}
			return null
		}
	}
}
</script>

<style lang="less" scoped>
.el-checkbox {
	margin: 0 10px 0 0 !important;
}

.previewImg {
	width: 100%;
}

.btnAdd {
	margin-top: 15px;
}
</style>
